whlpny said:
Sounds like your question has been answered - groundspeed is unchanged. Now I have a question- In stock form- do the 200 and 400 series tractors have the same ground speed? Where do the differences lie- in the ring gear or the hyd motor output? I am contemplating a new project and need info!
In order to answer your question, I need to set some parameters.
- my answer applies only to tractors made after 1970
- there were minor differences in the pumps used in the various 200/400/600 models over the years and those differences in GPM will affect the ground speed slightly.
- there was an optional high range gear that was offered which slowed down the max ground speed but this was either retrofitted by the dealer or tractor owner OR special ordered at the time of purchase.
Taking into account the above, the trans-axle components used on all three series of tractors are identical with the exception of wheel bolt pattern and drive motors used. The 200 series tractors used a drive motor with a smaller internal displacement than the motor used on the 400/600 series and that's how the factory attempted to level the playing field when it came to ground speed. However, if you consult the Operator's Manuals that cover both the 200 and 400 models in a given serial number bracket, you will see that the 200's had a higher ground speed than the 400 models.
As an example, Op Manual 9-7074, which covers 220, 222, 224 and 444 models .....shows the the following.
Low Range 4 MPH for 200 models and 3.7 MPH for the 444
High Range 9.4 MPH for 200 models and 8.7 MPH for the 444
Engine HP in either model plays no part as all of this is based upon 3600 RPM governed engine speed.
Keep in mind that Case and Ingersoll used hydraulic components from many different companies over the years such as Parker, Cessna, Wooster, Barnes etc and while they attempted to spec the size of the pump, it did vary slightly.
If you wanted a low speed, high torque articulated tractor, then you could use trans-axles from the 200 series so that you got the 5 bolt wheel pattern and then change to motors from a 400 series tractor.
Or you could go the other way and select 400 series trans-axles so you had the larger diameter 16" rims/tires and then install 200 series motors that spin faster when the same GPM of oil is applied to them. However, torque would suffer as a result.
Alternatively, you can choose a larger or smaller displacement gear pump to affect the ground speed either up or down. You could also choose to use a hydrostatic pump if you had no intentions of running motorized attachments from the tractor. The hydro pump could be controlled easily with your foot for both direction and infinite ground speed.